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Inevitably the question will come up about putting an Allison or a roadranger in a M 809 series truck or a deuce. Remember these vehicles have an interlock between the transmission and the transfer case so the transfer case knows which direction the transmission is going. So ya you can get one...

Reference post 6: The stock transmission is direct drive. If you go to an overdriven transmission the truck will go faster. But then again if you want to go fast you could get a KW or a Pete with double Os in it and go 100 mph loaded no problem.